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Mortgage Servicing Rights (Tables) | 12 Months Ended
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Dec. 31, 2018
Transfers and Servicing [Abstract] |
Changes in the Company's mortgage servicing rights | Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows, for the periods presented:
Carrying Value at January 1, 2017 | $ | 26,302 |
Capitalization | 16,973 |
Amortization | (3,936 | )
Carrying Value at December 31, 2017 | $ | 39,339 |
Capitalization | 13,905 |
Amortization | (5,014 | )
Carrying Value at December 31, 2018 | $ | 48,230 |
Data and key economic assumptions related to the Company's mortgage servicing rights | Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31 are as follows:
| 2018 |  | 2017 |  | 2016
Unpaid principal balance | $ | 4,635,712 |  |  | $ | 4,012,519 |  |  | $ | 2,763,344 |
Weighted-average prepayment speed (CPR) | 7.95 | % |  | 8.04 | % |  | 7.34 | %
Estimated impact of a 10% increase | $ | (1,264 | ) |  | $ | (1,592 | ) |  | $ | (1,034 | )
Estimated impact of a 20% increase | (2,569 | ) |  | (3,095 | ) |  | (2,010 | )
Discount rate | 9.45 | % |  | 9.69 | % |  | 9.64 | %
Estimated impact of a 100bp increase | $ | (2,657 | ) |  | $ | (2,027 | ) |  | $ | (1,368 | )
Estimated impact of a 200bp increase | (5,103 | ) |  | (3,896 | ) |  | (2,629 | )
Weighted-average coupon interest rate | 4.04 | % |  | 3.89 | % |  | 3.83 | %
Weighted-average servicing fee (basis points) | 27.47 |  |  | 26.36 |  |  | 25.87 |
Weighted-average remaining maturity (in years) | 8.03 |  |  | 7.98 |  |  | 11.11 |

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- Definition Schedule of fair value assumption related to mortgage servicing rights. + References No definition available. + Details
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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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